Table 2.
Correlation of MR parameters with the mechanical properties of the whole disc under compression.
| MR metric | Mechanical property | Compressive Loading |
|---|---|---|
| T2 | Dynamic Stiffness (SD) | r2= 0.33, P < 0.05 |
| Instantaneous stiffness (E1) | P > 0.05 | |
| Long term stiffness (E2) | r2= 0.28, P < 0.05 | |
| Damping coefficient (η1) | P > 0.05 | |
| ADC | Dynamic Stiffness (SD) | r2= 0.44, p <0.01 |
| Instantaneous stiffness (E1) | r2= 0.35, p <0.05 | |
| Long term stiffness (E2) | r2= 0.30, p <0.05 | |
| Damping coefficient (η1) | r2= 0.45, p = 0.01 |
T2: (ms). ADC: (10−4.mm2/sec). SD: Dynamic Stiffness computed from the linear region of the loading phase at the tenth load of the compression cyclic test. Rheological parameters were computed from the viscoelastic model; E1(Mpa): Instantaneous stiffness. E2 (Mpa): Long term stiffness. η1 (N/sec2): Damping coefficient.